The revenue (in dollars) from the sale of x units of a product is 
Find the marginal revenue when 8 units are sold and interpret your result.
?
A. 140. So, if the sales go from 8 units sold to 7 units sold, the revenue will increase by about $140.
B. 20. So, if the sales go from 8 units sold to 9 units sold, the revenue will increase by about $20.
C. 8. So, if the sales go from 8 units sold to 9 units sold, the revenue will increase by about $8.
D. 280. So, if the sales go from 8 units sold to 9 units sold, the revenue will increase by about $280.
E. 70. So, if the sales go from 8 units sold to 9 units sold, the revenue will increase by about $70.
Answer: E
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Solve the problem.Suppose that the function y = f(x) is increasing on the interval (2, 6). Over what interval is the graph of 
increasing?
A. (-2, 2) B. (8, 24) C. (2, 6) D. (6, 10)
Provide an appropriate response.True or False. If the graph of y = f(x) is symmetric with respect to the 
then the graph of y = -f(x) is not symmetric with respect to the y-axis.
A. False B. True
Write the complex number in trigonometric form r(cos ? + i sin ?), where r is exact and -? < ? ? ?.-6 - 6
i
A. 12 
B. 12 
C. 6 
D. 6 
Simplify the expression, writing the answer as a single term without negative exponents.
A. 
B. 
C. 
D. 